7120/1-5
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Generell informasjon
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Brønnhistorie
GeneralWell 7120/1-5 was drilled as an appraisal well on the Gotha discovery in the southern part of the Loppa High in the Barents Sea. The objectives were to test the distribution and quality of the Permo-Triassic conglomerate, test the quality of the Permian reservoir, to reduce the uncertainty of the time-depth conversion and to provide information relating to additional prospectivity in the southern Loppa High area. Planned TD was 2920 m.Operations and resultsAppraisal well 7120/1-5 was spudded with the semi-submersible installation Leiv Eiriksson on 2 March 2017 and drilled to TD at 2527 m in the Late Permian Røye Formation. After coring in the 8 ½" section the rate of penetration was very slow, and since the well proved only shows and no moveable hydrocarbons at Gotha reservoir level TD was set earlier than planned. The well was drilled with seawater and hi-vis pills down to 662 m and with Performadril water-based mud from 662 m to TD.A 285 metres gross sequence of Permian age spiculitic carbonates with poor reservoir quality was penetrated from 2241.5 m to TD. The Permo-Triassic conglomerate was absent. No pressure gradients could be established due to poor reservoir quality and/or wellbore damage resulting in seal failure. Minor oil shows were observed in siltstones and sandstones of the upper Snadd Formation in the interval from 885 to 955 m. These were typically described as having no odour, no stain, weak yellow direct fluorescence, slow diffuse weak bluish white cut fluorescence, weak cream fluorescent residue, no visible residue. The Røye Formation spiculitic carbonates had intermittent oil shows all through, generally described as no to weak hydrocarbon odour, no to rarely spotty stain, dull greenish yellow to dull yellow direct fluorescence, slow streaming to blooming dull blue white cut fluorescence, dull bluish white to greenish yellow fluorescent residue. No visible residue.A total of 156 m of conventional core were cut in 7 cores in the Permian interval from 2243.6 to 2399.77 m with generally excellent recovery. Core-log shifts, in meters, for the seven cores were (in succession from core 1 to core section): -0.64, -0.08, -0.08, -0.29, -0.37, -0.81, -0.81. No fluid sample was taken.The well was permanently abandoned on 7 May 2017 as a dry well with shows.TestingNo drill stem test was performed. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]670.002529.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12243.62244.1[m ]22244.62271.6[m ]32271.62299.2[m ]42299.22318.2[m ]52318.22345.1[m ]62345.22372.5[m ]72372.52395.8[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]151.6Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Foringsrør og formasjonsstyrketester
Foringsrør og formasjonsstyrketester Type utforingUtforing diam.
[tommer]Utforing dybde
[m]Brønnbane diam.
[tommer]Brønnbane dyp
[m]LOT/FIT slam eqv.
[g/cm3]Type formasjonstestCONDUCTOR30435.536437.50.00SURF.COND.20655.526662.01.36LOTPILOT HOLE662.09 7/8662.00.00INTERM.13 3/81115.117 1/20.01.39LOTINTERM.9 5/82210.512 1/42218.01.50LOTOPEN HOLE2527.08 1/22527.00.00 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]FMI PPC MSIP GR JAR3682505MDT GR JAR22582349MSCT GR22212442MSCT GR22402523MWD - CCN ORD OTK SDTK ZTK10472218MWD - CCN ORD OTK SDTK ZTK ST21952527MWD - OTK369662MWD - OTK SDTK6091117MWD - OTK SDTK ZTK21142243UBI HRLA ADT PEX GR JAR22112526XPT LTS CMR GR JAR22112511ZOVSP3842518 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet3693694534536866862240224022422242 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling4211.0550.0Bentonite Sweeps4211.5045.0Displacement mud5061.2315.0Performadril5801.0550.0Bentonite Sweeps5801.5035.0Displacement mud6001.2316.0Performadril6621.0350.0SWEEPS6621.2012.0PERFORMADRIL6621.3920.0Displacement mud6731.2015.0PERFORMADRIL8831.2118.0PERFORMADRIL10861.2221.0PERFORMADRIL14481.2321.0Performadril15851.2220.0Performadril19621.2121.0Performadril21051.2222.0Performadril21101.2120.0Performadril21581.2020.0Performadril21601.1515.0Performadril22171.1420.0Performadril22181.2119.0Performadril22231.1420.0Performadril22701.1518.0Performadril23161.1517.0Performadril25271.1515.0Performadril